docs: def main(_):
    """Load a trained algorithm and render videos."""
    utility.set_up_logging()
    if not FLAGS.logdir or not FLAGS.outdir:
      raise KeyError('You must specify logging and outdirs directories.')
    FLAGS.logdir = os.path.expanduser(FLAGS.logdir)
    FLAGS.outdir = os.path.expanduser(FLAGS.outdir)
    visualize(
        FLAGS.logdir, FLAGS.outdir, FLAGS.num_agents, FLAGS.num_episodes,
        FLAGS.checkpoint, FLAGS.env_processes)